Four-stroke internal combustion engine



July 5, 1932. P. FINDEISEN FOUR-STROKE INTERNAL COMBUSTION ENGINE Filed April 25, 1931 l J i Fall. I:-

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Patented July 5, 1932 PAUL FINDETSEN, 01' BERLIN, GERMANY FOUR-STROKE INTERNAL COMBUSTION ENGINE Application filed April 25, 1981, Serial No. 582,952, and in Germany April 28, 1930.

My invention relates to a four-strolrainternal combustion on 'no with four pistons secured to the ends an H-shaped connecting member. According to the invention the H-shaped connecting member is directly jointed to the connectin posite points on the cy 'der wall by means of slidable blocks disposed on extensions 01f the gudgeon pin on which one end of the connecting rod is mounted.

Due to this method of'support the connecting member is so guided that it is not sub-' ject to transverse stresses and the pressure is favorably distributed in the bearings of the connecting rod.

This method of support also provides a compact construction of the engine, very short pistons may be employed and it is moreover possible to lubricate two cylinders situated opposite each other in the direction of stroke from a common oil-conduit situated in the wall of the casing midway of the cylinders. The oil is distributed by the slidable blocks. To further facilitate the absorption of pressure by the bearings of the connecting rod the arms of the H-shaped connecting member, that constitute each two piston rods, are curved against each other in their middle parts. This curvature moreover provides room for fitting the slide blocks to the H- shaped connecting member. The slide blocks are preferably mounted on the gudgeon pin. The H-shaped connecting member may be built up of single parts or made in one piece.

A construction according to the invention is illustrated by way "of example in the accompanying drawing in which Figure 1 is a section through all the four cylinders of a four-stroke internal combustion engine, and v Figure 2 a section on line A-A of Figure 1.

The four pistons-1, 2, 3, 4 are secured to the four branches a of an H-shaped connecting member constituted by several single parts secured together. The two' branches (1 of the connecting member, each of which connects two pistons situated opposite each other in the direction of stroke, referably belon to one single piston rod. T e connecting rod 0d and bears at opof the said gudgeon pin projecting beyond the piston rods are mounted the blocks d which slide on the cylinder wall. The upper and lower cylinders are lubricated from a common central oil conduit (2. The oil entering the cylinders through the conduit 6- is distributed by the slidable blocks d to the pis- I ton during its travel. The slidable blocks w at the same time distribute the oil around the cylinders.

The slidable blocks favorably distribute the explosion and compression pressures which as a rule act onesidedly on the connecting member. The H-shaped connecting member being not only guided by the pistons, the latter may be very short and light, with consequent reduction of friction, weight and oil consumption, and increase of power.

When the number of cylinders is increased by four additional units, the engine may be built in a V-shape.

What I claim is 1. A four-stroke internal combustion en gine comprising in combination four pistons travelling in corresponding cylinders, an H- shaped connecting member for securing the said pistonsto its free ends, slidable blocks arranged on extensions of the cross pin at both sides of thesaid H-shaped connecting member for supporting the latter on the casing wall, and a connecting rod connected to the said cross pin. V 2. A four-stroke internal combustion en-. gine according to claim 1, with a lubricant conduit in the parts with which the said slidable blocks of the H-shaped connecting member engage. 90

In testimony whereof I afiix m signature.

. PAUL FIN EISEN. 

